Primary diffuse large B-cell lymphoma of the ethmoid sinus: a case report.

B-cell lymphoma of the paranasal sinuses is rare. We present the case of a 42-year-old woman who presented with proptosis, diplopia, and vision disturbances in the right eye. She was diagnosed with diffuse large B-cell lymphoma of the ethmoid sinus. We describe the general clinical presentation, diagnosis, and differential diagnosis of this entity, and we review the pathology of diffuse large B-cell lymphoma.